kvm/x86: Hyper-V fix SynIC timer disabling condition
authorAndrey Smetanin <asmetanin@virtuozzo.com>
Mon, 28 Dec 2015 15:27:22 +0000 (18:27 +0300)
committerPaolo Bonzini <pbonzini@redhat.com>
Fri, 8 Jan 2016 18:04:41 +0000 (19:04 +0100)
Hypervisor Function Specification(HFS) doesn't require
to disable SynIC timer at timer config write if timer->count = 0.

So drop this check, this allow to load timers MSR's
during migration restore, because config are set before count
in QEMU side.

Also fix condition according to HFS doc(15.3.1):
"It is not permitted to set the SINTx field to zero for an
enabled timer. If attempted, the timer will be
marked disabled (that is, bit 0 cleared) immediately."

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
CC: Gleb Natapov <gleb@kernel.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Roman Kagan <rkagan@virtuozzo.com>
CC: Denis V. Lunev <den@openvz.org>
CC: qemu-devel@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/hyperv.c

index 5f85c12b223c225843a0fc48e22d3df9a9c58d59..abfb9208ae531999cbd9d82618a43f3ddba43466 100644 (file)
@@ -474,7 +474,7 @@ static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
 static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
                             bool host)
 {
-       if (stimer->count == 0 || HV_STIMER_SINT(config) == 0)
+       if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0)
                config &= ~HV_STIMER_ENABLE;
        stimer->config = config;
        stimer_cleanup(stimer);